gehrckens



o. o. GEHRGK'ENS. DRIVING BELT.'

No.' 309,708. Patented Deo. 23, 1884.

8 sheets-sheet 2.

(Ne Medel.)

' 8. 0. GBHRGKBNS.

DRIVING BELT. l Ne. 808,708. Y Peeeneed Dee. 28, 1884.

Witllesseg; Inventor Carl 0m) ahrc-kms.

lhvirnn l Prins artnr trier.

CARL OTTO GEHROKENS, OF HAMBURG, GERMANY.

DRIVING=BELT.

SPECIFICATION forming part of Letters Patent No. 309,708, dated December 231, 1884.

Application filed October 13, 1884. (No model.)

To all whom it may concern,.-

Be it known that I, CARL OT'ro Gnnizoiinns, a subject of the Emperor` of Germany, and a resident ot' Hamburg, in the German Empire, have invented certain new and useful Improvements in Driving-Belts, of which the fol lowing is a specication.

The invention relates to improvements in crossed or half-crossed driving-belts; and the object of my improvements is to thicken such belts partly lengthwise.

The outer edge of half-crossed belts becomes longer than the inner one by using common belts, as the radius of the curve described by the outer edge is longer than the radius of the inner curve. To prevent such inconvenience and to obtain an equal tension on both edges of such belt, I lengthen according to my invention the radius 0f that part 0f the pulley whereon the inner edge of the belt is ruiming by placing lengthwise one strip, a, or two or more, of the belting material under the inner edge of the belt, (as is illustrated in Figure l ofthe accompanying drawings by aside elevation, and in Fig. l.Al in a crosssection of the belt,) until the tension on both edges of such belt is equalized.

Vhen driving by open belts conical pulleys arranged by pairs in such a manner as to bring the smallest diameter of the one opposite to the largest diameter of the other one, as shown in Fig. 2 by a top view, I use belts double or nearly double as broad as usually by placing the thickening-strip a into the center of such belt, as illustrated by the cross-section, Fig. 2"@ One edge of the belt thereby will run freely without or by slightly touching the pulley,

while that surface of the belt which is neces` sary for transferring the power is kept in proper contact with the pulley.

Conical pulleys when arranged in the abovedescribed manner, but driven by crossed belts, as illustrated by the top view Fig. 3', require belts with thickening-strips c at one vedge of the belt, whereof Figs. 3 and 3 show crossseetions of the belt` with reference to the adjacent pulleys) as the thickening-strip equalizes the diameters of the opposite parts of such conical pulleys.

Vhen driving shafts which may or may not be at right angles, but in or near the same plane, by ruiming the belt on four 0r more pulleys, as it may be seen in the side elevation, Fig. 4, both edges ofthe belt have to make alonger way than its center. I therefore place a thickening-'strip, a, beneath such center line, as shown in the cross-section, Fig. 4, thereby equalizing the velocity of all parts of the belt.

Having thus fully described the nat-ure of my said invention. what I desire to claim and secure by Letters Patent is* l. In combination with a driving-belt, one, two, or more thickening-strips, a, placed beneath one edge of the belt, substantially as and for the purpose specified.

2. In combination with a driving-belt, one, two, or more thickening-strips, a, placed beneath the center line ofthe belt, substantially as and for the purpose speciiied.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two witnesses.

ALEXANDER Senor-rr, DinDRicH Pattensen. 

